Aptitude - Compound Interest - Discussion
Discussion Forum : Compound Interest - General Questions (Q.No. 2)
2.
The difference between simple and compound interests compounded annually on a certain sum of money for 2 years at 4% per annum is Re. 1. The sum (in Rs.) is:
Answer: Option
Explanation:
Let the sum be Rs. x. Then,
| C.I. = |  |
x |  |
1 + | 4 |  |
2 | - x |  |
= | |
676 | x | - x | |
= | 51 | x. |
| 100 | 625 | 625 |
| S.I. = | |
x x 4 x 2 | |
= | 2x | . |
| 100 | 25 |
 |
51x | - | 2x | = 1 |
| 625 | 25 |
x = 625.
Discussion:
149 comments Page 7 of 15.
Chetan siyota said:
1 decade ago
Short trick if you have given difference between simple and compound interest,
SI-CI = P*square of (R/100).
SI-CI = P*square of (R/100).
Atanu said:
1 decade ago
Shortcut Method
sum = difference*(100/R)^2 for 2 year
sum = {difference*(100^3)}/{R^2*(300+R)} for 3 year
sum = difference*(100/R)^2 for 2 year
sum = {difference*(100^3)}/{R^2*(300+R)} for 3 year
Aparna said:
1 decade ago
P(1+0.04)^2-P)-P*0.08.
From the above step how did you got that P(1/625) = 1.
Can you please explain me?
From the above step how did you got that P(1/625) = 1.
Can you please explain me?
Rick said:
1 decade ago
You people should add the formula of C.I in the formula section which is missing.
C.I = p[(1+r/100)^n -1].
C.I = p[(1+r/100)^n -1].
Sneha said:
8 years ago
Difference formula for 2 years____.
Sum = Difference * (100) ^/Rate^
Then, Sum = 1*100*100 / 4*4 =625.
Sum = Difference * (100) ^/Rate^
Then, Sum = 1*100*100 / 4*4 =625.
Prudhvi said:
1 decade ago
Hai I'm prudhvi. Can any one help me out?
Why are we using 676/625x in the step one?
Please help me.
Why are we using 676/625x in the step one?
Please help me.
Yashika said:
8 years ago
The SI = CI when the principal and rate are the same and time is ________.
Please give me the answer.
Please give me the answer.
Ritu said:
8 years ago
Please, someone explains the question. At what % per annum will 625 will amount to 676 in 2 yr at c.i.
ANUPAM DAS said:
9 years ago
We know that,
(C.I - S.I) = P * R * R/100 * 100.
HERE, 1 = P * 4 * 4/100 * 100.
P = 25 * 25 = 625.
(C.I - S.I) = P * R * R/100 * 100.
HERE, 1 = P * 4 * 4/100 * 100.
P = 25 * 25 = 625.
Chinmoy Mondal said:
9 years ago
Very simple formula is;
p.(R/100)^2 = (compound interest - Simple interest) time duration 2 years.
p.(R/100)^2 = (compound interest - Simple interest) time duration 2 years.
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